CN101202583B - Method for generating forward data rate in a communicating system - Google Patents
Method for generating forward data rate in a communicating system Download PDFInfo
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- CN101202583B CN101202583B CN2006101651448A CN200610165144A CN101202583B CN 101202583 B CN101202583 B CN 101202583B CN 2006101651448 A CN2006101651448 A CN 2006101651448A CN 200610165144 A CN200610165144 A CN 200610165144A CN 101202583 B CN101202583 B CN 101202583B
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Abstract
The invention discloses a generating method for forward data speed in a communicating system which includes: step one, a mobile terminal gets the channel environment of the mobile terminal and works out the coherence time sequences according to the Doppler frequency shift of the channel environment as well as works out the weight sequences under various predicted lengths according to the coherence time sequences; the mobile terminal receives the pilot signal transmitted by a base station in the current half time slot and works out the snr of the pilot signal and simultaneously saves the snr; step two, the mobile terminal judges whether a new forward speed control information needs to be generated or not in the current time, if needed, a step three is carried out , if not, a step four is carried out; step three, the mobile terminal utilizes the predicted time length, the weight sequences and the snr of the forward pilot signal to update the reported forward speed control information; step four, the mobile terminal reports the forward speed control information to the base station through a DRC channel, and when the system runs to the next moment, the step one is carried out circularly.
Description
Technical field
The present invention relates to the method for transfer of data in a kind of mobile communication, the generation method of forward data rate in particularly a kind of CDMA 2000EV-DO standard.
Background technology
CDMA2000 EV-DO is a kind of wireless tranmission techniques that aims at mobile data applications and carried out optimization; With mainly be in order to optimize the 1x compared with techniques of voice and moderate rate transfer of data; EV-DO (Evolution of Data Optimized; Data-optimized evolution) technology has been done to optimize and improve to aspects such as capacity, message transmission rate and wireless interconnected accesses, and fl transmission adopts time division multiplexing mode, and reverse transfer adopts the code division multiplexing mode.
In the CDMA2000 EV-DO system actual moving process; Portable terminal confirms that according to the quality of the forward pilot that receives forward direction should be with which kind of speed grade to oneself transmission data; And through DRC (Data Rate Control; Data value control) channel reports the base station with this information real-time, and when the base station determines to the rate sending data of portable terminal according to its application through certain dispatching algorithm.Portable terminal need confirm that through a series of complicated algorithm own present residing channel circumstance is slow fading or rapid fading according to the mass change of forward pilot in the said process; Or marginal certain decline; Confirm only fl transmission speed grade then; This method need be carried out a large amount of calculating; Can consume the calculation resources of a large amount of portable terminals; But the pertinent literature referenced patent number is US6426971B1, and name is called the american documentation literature of " System and Method for Accurately Prediction Signal to Interference and Noise Ratio to Improve Communications System Performance ".
Summary of the invention
The technical problem that the present invention will solve is, the generation method of forward data rate in a kind of communication system is provided, and the computational burden of CDMA2000 EV-DO system running portable terminal is reduced.
For achieving the above object, the present invention proposes the generation method of forward data rate in a kind of communication system, and this method comprises:
Step 1; Portable terminal obtains its channel circumstance of living in; Doppler frequency shift according to this channel circumstance draws sequence coherence time; And according to this coherence time sequence draw the weight sequence under the different prediction lengths, this portable terminal receives the pilot signal that send in current half crack base station, and draws this pilot signal signal to noise ratio and preserve this signal to noise ratio simultaneously;
Step 2, this portable terminal judge whether current time need generate new forward direction rate control information, and if desired, then execution in step three, if do not need, then execution in step four;
Step 3, portable terminal utilize the when said weight sequence of the noise of predicted time length, forward pilot signal to upgrade the forward direction rate control information that reports;
Step 4, portable terminal reports the forward direction rate control information to give the base station through the DRC channel, and system runs to next constantly, and said step 1 is carried out in circulation.
The generation of forward data rate control letter method in the above-mentioned communication system; It is characterized in that; Whether said step 2 is can be divided exactly by current half crack through the DRC length of judging regulation to judge whether that needs generate new forward direction rate control information, and aliquot then need generate new forward direction rate control information; Aliquant, then need not generate new forward direction rate control information.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and said step 3 further comprises:
Step 31; The signal to noise ratio of the pilot signal that a plurality of halfs crack obtained before the half crack before portable terminal when deserved based on the noise of the pilot signal in said current half crack is selected the corresponding weight of this portable terminal under the different prediction lengths from said weight sequence, draw the prediction signal to noise ratio under the different prediction lengths;
Step 32 is according to the corresponding prediction signal to noise ratio that draws under the different time-gap number of timeslot number in the packet format of stipulating in the prediction signal to noise ratio under the said different prediction lengths and the CDMA2000 EV-DO standard;
Step 33, a snr threshold table of safeguarding based on the prediction signal to noise ratio under the said different time-gap number and portable terminal oneself relatively draws the packet format of obtainable maximum rate under the different time-gap number;
Step 34, said portable terminal select the packet format of maximum rate as final packet format, upgrade the forward direction rate control information that reports, and carry out said step 4.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and sequence coherence time in the said step 1 is passed through formula T
c=9* λ/(16* π * v) calculates, wherein T
cBe sequence coherence time, λ is a carrier wavelength, and v is a portable terminal speed.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and the weight sequence in the said step 1 is through formula w=(m/600-T
c)/α * T
cCalculate, wherein, w is the weight sequence, and m is the predicted time length sequences, and α is a constant, T
cBe said coherence time of sequence;
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and the prediction signal to noise ratio in the said step 31 is through formula
Calculate, wherein, F_SNR
sBe prediction signal to noise ratio, SNR
CurBe the current signal to noise ratio of pilot signal, N is half timeslot number before the current half crack, SNR
iBe i half crack in N the half crack before the current half crack of mobile terminal stores (the forward pilot signal signal to noise ratio of 1≤i≤N) obtain, w
SnFrom w, select the down own corresponding weight of different prediction length n for portable terminal according to own residing channel circumstance, wherein w is the weight sequence.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and said prediction length sequence m value can be 1,2 ..., 64.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and said constant alpha value is 8.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, said weight sequence w more than or equal to 0 smaller or equal to 1.
The generation method of forward data rate is characterized in that in the above-mentioned communication system, and the half crack number N value before the said current half crack is 128.
Compared with prior art; The present invention lets own this condition of residing channel circumstance of portable terminal acquisition let portable terminal adopt forward data rate generation method more simply fast through certain mode through hypothesis; Thereby reduce the computational burden of portable terminal, strengthen the stand-by time of portable terminal.
Description of drawings
Fig. 1 is the flow chart of the present invention's generation method of forward data rate in communication system;
Fig. 2 is the realization flow figure of the present invention generation method one embodiment of forward data rate in communication system.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and embodiment.The generation method of forward data rate in the CDMA2000EV-DO provided by the invention system running; Be to let portable terminal obtain own this condition of residing channel circumstance through certain mode through hypothesis let portable terminal adopt forward data rate generation method more simply fast, may further comprise the steps (like Fig. 1):
Step S101; Portable terminal obtains its channel circumstance of living in; Doppler frequency shift according to this channel circumstance draws sequence coherence time; And according to this coherence time sequence draw the weight sequence under the different prediction lengths, this portable terminal receives the pilot signal that send in current half crack base station, and calculates this pilot signal signal to noise ratio and preserve this signal to noise ratio simultaneously;
Step S102, this portable terminal judge whether current time need generate new forward direction rate control information, if desired, execution in step S103 then, if do not need, direct execution in step S104 then;
Step S103, portable terminal utilize the signal to noise ratio of said predicted time length, weight sequence and Forward Pilot Channel to upgrade the forward direction rate control information that reports;
Step S104, portable terminal reports the forward direction rate control information to give the base station through the DRC channel, and system runs to next constantly, circulation execution in step S101.
Below with specific embodiment specify of the present invention in communication system the generation method of forward data rate.
According to the description of the disclosed standard document of 3GPP2 " cdma2000 Evaluation Methodology Revision0 ", the system emulation of CDMA2000 EV-DO forward direction comes the running of analogue system and then the forward performance index of the system of acquisition through the system model of setting up 19 sub-districts (3 sectors/cells) and the dissimilar portable terminal that in interested sector, distributes.In the simulation process, portable terminal channel circumstance of living in is known, so the method generation forward data rate that can utilize the present invention to propose in the CDMA2000 EV-DO system emulation, improves system emulation efficient, and as shown in Figure 2, concrete steps are following:
Step S201 calculates sequence T coherence time under the different channels environment in the emulation according to formula (1)
c, λ is a carrier wavelength in the formula (1), v is a portable terminal speed;
T
c＝9*λ/(16*π*v) (1)
Step S202 calculates the weight sequence w (value less than 0 is mapped as 0, and the value greater than 1 is mapped as 1) under different prediction lengths according to formula (2), and m is-the prediction length sequence in the formula (2), and its value is generally 1,2..., and 64, α is a constant, value is 8 usually;
w＝(m/600-T
c)/α*T
c，0≤w≤1 (2)
Step S203, portable terminal (mobile phone) is given at current half crack i (supposing the system is since 1 counting) pilot signal transmitted in the base station, and portable terminal receives pilot signal and calculates its signal to noise ratio, and it is stored in the time-limited data structure (FIFO);
Step S204, judge current half crack i divided by the DRC length of emulation regulation (unit: whether the remainder that obtains the half crack) is 0, if not; Portable terminal sends original DRC information through the DRC channel; I=i+1 changes step S203 over to, if change step S205 over to;
Step S205, portable terminal receives the pilot signal of sending the base station and calculates its signal to noise ratio snr
Cur, suppose that the forward pilot signal signal to noise ratio that obtains in N the half crack before, current half crack of mobile terminal stores is SNR
1..., SNR
N, the common value of N is 128, portable terminal is selected the down own corresponding weight w of different prediction length n according to own residing channel circumstance from w
Sn, and according to the prediction signal to noise ratio F_SNR under the different prediction lengths of formula (3) calculating
n,
Prediction signal to noise ratio F_SNR under the different prediction length n that step S206, portable terminal will obtain
nBe mapped with the timeslot number s in the packet format of stipulating in the CDMA2000 EV-DO standard, obtain the prediction signal to noise ratio F_SNR under the different time-gap number
s, and a snr threshold table of safeguarding with portable terminal oneself is relatively, obtains the packet format that different time-gap is counted obtainable maximum rate under the s, i.e. F_SNR
sGreater than the snr threshold table in timeslot number in the packet format be the maximum corresponding packet format PacketType of threshold value in the threshold value of packet format of s
s, portable terminal is selected the PacketType of maximum rate
sAs final packet format, upgrade DRC information, and this information is reported the base station through the DRC channel, i=i+1 changes step S203 over to.The initial value of the snr threshold table that aforesaid portable terminal is safeguarded is that portable terminal is own; Behind the connecting system of terminal, constantly adjust these initial values according to become better before receiving bag or rascal voluntarily, if good bag; The certain amplitude a of all initial values declines; If rascal, the certain amplitude b of all initial values risings, the desired Packet Error Ratio of fl transmission equals a/ (a+b) usually.
Take a concrete example below and describe said process: calculate sequence T coherence time under the different channels environment when system emulation begins earlier
c, suppose to have now two kinds of channel circumstance A (3km/h, 1 footpath), B (120km/h, 1 footpath), then T
c={ 32.229,0.80572} calculates the weight sequence w under the different prediction lengths then, supposes prediction length for (1,2), w={0 then, 0; 1,1}, first row among the w 0, the corresponding environment A of 0}, second row 1, and the corresponding environment B of 1}, next the every half in base station crack can be to the portable terminal pilot signal transmitted, and portable terminal calculates the signal to noise ratio and the storage of the pilot tone of receiving.If current half crack is the integral multiple of the DRC length of emulation regulation, then calculate F_SNR
n, suppose to have 4 kinds of packet format PA, PB, PC, PD, comprise two kinds of slot lengths in the packet format, (corresponding PA is PB) with 2 (corresponding PC, PD), portable terminal is among the channel circumstance A, the pilot tone signal to noise ratio snr of storage before the portable terminal to be 1 respectively
NAll be 1, the current pilot signal to noise ratio snr
CurBe 5, w then
Sn=0,0}, F_SNR={5; 5}, wherein first 5 corresponding packet format slot length is the following pilot frequency intensity of portable terminal estimation in 1 o'clock, second 5 corresponding packet format slot length is the following pilot frequency intensity of portable terminal estimation in 2 o'clock; Suppose that packet format PA, PB, PC, PD corresponding threshold are respectively (1,6,2; 7), then portable terminal is selected PA from PA, PB packet format, from PC, PD packet format, selects PC; If packet format PC rate corresponding is greater than PA, then portable terminal finally selects packet format PC to report the base station as the information content of DRC Channel Transmission; If current half crack is not the integral multiple of the DRC length of emulation regulation, then portable terminal continues to receive the pilot frequency information that send the base station, and reports original DRC information through the DRC channel, and the rest may be inferred.
Though the present invention discloses as above with a preferred embodiment; Right its is not in order to limit the present invention; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the generation method of forward data rate in the communication system is characterized in that, comprising:
Step 1; Portable terminal obtains its channel circumstance of living in; Doppler frequency shift according to this channel circumstance draws sequence coherence time; And according to this coherence time sequence draw the weight sequence under the different prediction lengths, this portable terminal receives the pilot signal that send in current half crack base station, and draws this pilot signal signal to noise ratio and preserve this signal to noise ratio simultaneously;
Step 2, this portable terminal judge whether current time need generate new forward direction rate control information, and if desired, then execution in step three, if do not need, then execution in step four;
Step 3, portable terminal utilize the when said weight sequence of the noise of predicted time length, forward pilot signal to upgrade the forward direction rate control information that reports;
Step 4, portable terminal reports the forward direction rate control information to give the base station through the DRC channel, and system runs to next constantly, and said step 1 is carried out in circulation.
2. the generation method of forward data rate in the communication system according to claim 1; It is characterized in that; Whether said step 2 is can be divided exactly by current half crack through the DRC length of judging regulation to judge whether that needs generate new forward direction rate control information, and aliquot then need generate new forward direction rate control information; Aliquant, then need not generate new forward direction rate control information.
3. the generation method of forward data rate is characterized in that in the communication system according to claim 1 and 2, and said step 3 further comprises:
Step 31; The signal to noise ratio of the pilot signal that a plurality of halfs crack obtained before the half crack before portable terminal when deserved based on the noise of the pilot signal in said current half crack is selected the corresponding weight of this portable terminal under the different prediction lengths from said weight sequence, draw the prediction signal to noise ratio under the different prediction lengths;
Step 32 is according to the corresponding prediction signal to noise ratio that draws under the different time-gap number of timeslot number in the packet format of stipulating in the prediction signal to noise ratio under the said different prediction lengths and the CDMA2000 EV-DO standard;
Step 33, a snr threshold table of safeguarding based on the prediction signal to noise ratio under the said different time-gap number and portable terminal oneself relatively draws the packet format of obtainable maximum rate under the different time-gap number;
Step 34, said portable terminal select the packet format of maximum rate as final packet format, upgrade the forward direction rate control information that reports, and carry out said step 4.
4. the generation method of forward data rate is characterized in that in the communication system according to claim 1, and sequence coherence time in the said step 1 is passed through formula T
c=9* λ/(16* π * v) calculates, wherein T
cBe sequence coherence time, λ is a carrier wavelength, and v is a portable terminal speed.
5. the generation method of forward data rate is characterized in that in the communication system according to claim 1, and the weight sequence in the said step 1 is through formula w=(m/600-T
c)/α * T
cCalculate, wherein, w is the weight sequence, and m is the predicted time length sequences, and α is a constant, T
cBe said coherence time of sequence.
6. the generation method of forward data rate is characterized in that in the communication system according to claim 3, and the prediction signal to noise ratio in the said step 31 is through formula
Calculate, wherein, F_SNR
nBe prediction signal to noise ratio, SNR
CurBe the current signal to noise ratio of pilot signal, N is half timeslot number before the current half crack, SNR
iBe i half crack in N the half crack before the current half crack of mobile terminal stores (the forward pilot signal signal to noise ratio of 1≤i≤N) obtain, w
SnFrom w, select the down own corresponding weight of different prediction length n for portable terminal according to own residing channel circumstance, wherein w is the weight sequence.
7. the generation method of forward data rate is characterized in that in the communication system according to claim 5, and said prediction length sequence m value can be 1,2 ..., 64.
8. the generation method of forward data rate is characterized in that in the communication system according to claim 5, and said constant alpha value is 8.
9. the generation method of forward data rate is characterized in that in the communication system according to claim 5, said weight sequence w more than or equal to 0 smaller or equal to 1.
10. the generation method of forward data rate is characterized in that in the communication system according to claim 6, and the half crack number N value before the said current half crack is 128.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1375949A (en) * | 2002-04-28 | 2002-10-23 | 武汉汉网高技术有限公司 | Multiuser downstream grouping transmission quality control method for CDMA communication system |
| CN1421072A (en) * | 2000-02-23 | 2003-05-28 | 快捷通信公司 | Reverse link correlation filter in wireless communication systems |
| CN1717950A (en) * | 2002-09-10 | 2006-01-04 | 高通股份有限公司 | Estimation of uplink load with changed data rates |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1421072A (en) * | 2000-02-23 | 2003-05-28 | 快捷通信公司 | Reverse link correlation filter in wireless communication systems |
| CN1375949A (en) * | 2002-04-28 | 2002-10-23 | 武汉汉网高技术有限公司 | Multiuser downstream grouping transmission quality control method for CDMA communication system |
| CN1717950A (en) * | 2002-09-10 | 2006-01-04 | 高通股份有限公司 | Estimation of uplink load with changed data rates |
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